If you cannot communicate a concept clearly, then you don’t understand it well enough yourself.
Your blood can hold a record of past illnesses. That information can reveal how many people have had a certain infection – like 58% of Americans having had COVID-19 by the end of February 2022.
With access to testing limited and without other ways of measuring likely infection rates, New Zealand’s confirmed COVID cases are likely to be just a fraction of the total.
COVID-19 cases are skyrocketing across the US. Testing has ramped up over the past few months, but increasing hospitalizations, deaths and test-positivity rates show that the virus is out of control.
Test positivity rates measure the success of a testing program. Even though the US performs a huge number of tests, high test positivity rates across the country show that that it still isn’t enough.